spi: atmel-quadspi: Set endianness on 8D-8D-8D mode according to the flash requirements

Macronix swaps bytes on a 16-bit boundary when configured in Octal DTR.
The byte order of 16-bit words is swapped when read or write written in
8D-8D-8D mode compared to STR modes. Set the endianness flash requirements
to avoid endianness problems during.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

Author: ambarus

drivers/spi/atmel-quadspi.c

@@ -697,6 +697,8 @@ static int atmel_qspi_sama7g5_set_cfg(struct atmel_qspi *aq,
 		ifr |= QSPI_IFR_DDREN;
 		if (op->cmd.dtr)
 			ifr |= QSPI_IFR_DDRCMDEN;
+		if (op->data.dtr_bswap16)
+			ifr |= QSPI_IFR_END;
 
 		ifr |= QSPI_IFR_DQSEN;
 	}